Loud speaker



June 12, 1928,

iVAViWMMfWIIMW/ A. A. KENT LOUD SPEAKER Filed Oct. 17, 192 5 1 N VEN TOR.

BY W -(5w 1 A TTORNEY.

Patented June 12, 1928.

PATENT OFFICE.

ARTHUR AT'WATER KENT, OF ARDMORE, PENNSYLVANIA.

LOUD SPEAKER.

Application filed October 17, 1925.

My invention relates to loud speakers, such as amplifying telephones utilizable in radio receiving apparatus and other relations.

My invention resides in the combination of 6 a telephone unit, base and amplifying horn in which the horn is carried by or supported upon the telephone unit, independently of the base, and the latter attached to or integral with a portion of the telephone unit. My invention resides in structure of the character hereinafter described and claimed. For an illustration of one of the various forms my invention may take, reference is to be had to the accompanying drawing, which is a vertical sectional view, partly in elevation, of a radio speaker or amplifying telephone embodying my invention.

Referring to the drawing, the telephone unit comprises the housing or member H, the cap (J, the diaphragm D and a suitable magnet system carried by the cap C. The diaphragm D engages the annular rib or shoulder 1 within the member or housing H, being there held by pressure exerted from the under side through the washer orring 2,

preferably of rubber, by the end of the easing C, preferably of non-magnetic material and carrying the permanent magnet M of a magnet system including in addition the usual pole pieces 3 surrounded by the windings or coils 4 traversed by the sound-represent-ing current, such, for example, as exists in the anode circuit of a thermionic detector or audio frequency amplifier of aradio receiving system. The current leads 5 and 6 may be disposed in a cord 7 extending through an opening in th casing C and through an opening 8.

As indicated. the casing C is threaded into the housing H against the ring 2.

Integral with or attached to the housing member H, preferably between its upper and lower ends, is the base 9, by which the instrument as 'a. whole is supported upon a table or the like. a

The lower wall of the member H extends adjacent the diaphragm D, whereby the Serial No. 62,970.

volume of the space or the chamber between the diaphragm and the member H is suitably small for effective transmission of soundvwaves to the neck 10 of the amplifymg horn having at its enlarged end 11 a flange 12 to which is secured by screws, bolts or rivets 13 the bell 1-1. As indicated, the bell 14 may have recesses 14 to receive or accommodate the members 13. Adjacent the center of the member H it is rovided with the sound port 15 communicating with the sound passage 16 within the horn neck 10. The horn is carried by or secured to the member H. In the example indicated, the neck 10 is provided with a flange 17 secured to the upper end of the housing H by screws 18 In a structure of the character described, the diaphragm casing or housing of the telephone unit has the base attached thereto, and has a wall adjacent the diaphragm limiting the size of the chamber or space above the diaphragm, adjacent whose center is a sound port extending through the diaphragm housing and communicating with the sound passage of the horn, which is carried by the diaphragm housing.

What I claim is: v

1. An amplifying telephone comprising a diaphragm housing having an outer, plane surface, a diaphragm therein, a casing for said diaphragm, a telephone magnet system 7 carried by said casing, a base integral with said housing, a horn, and means comprising a radial flange in contact with said surface for coupling said horn to said housing.

2. An amplifying telephone comprising a diaphragm housing having an outer, plane surface, a diaphragm therein, a casing for said diaphragm, a telephone magnet system carried by said casing, a base integral with said housing, a horn, and a radial flange integral with said horn in contact with said 90 surface for coupling the horn to said hous- ARTHUR ATWATER KENT. 

